Cylindrical semi-trailer



FIG. 1 is a right side front perspective view of an embodiment of thedesign;

FIG. 2 is a right side rear perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is an enlarged rear view thereof;

FIG. 5 is an enlarged front view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the cylindrical semi-trailer thatform no part of the claim.

CLAIM The ornamental design for a cylindrical semi-trailer, as shown anddescribed.